Mikel Arteta moved smartly in the window to add Gabriel Jesus and Oleksandr Zinchenko.
Arsenal face their first big test this weekend.
Manchester United beat Liverpool last time out.
For the first time since 1992, United are bottom of the Premier League.
Liverpool manager Juergen Klopp and Liverpool's Fabio Carvalho after the match against Crystal Palace.
Guardiola said his players felt the pressure in Madrid.
Premier League - Southampton v West Ham United
What do you think was the most exiting part of Frank Leavers' sporting day?
Premier League - Chelsea v Arsenal.